What is the simple word than observe?

There isn't one single simple word that perfectly captures the meaning of "observe" in every context. It depends on what kind of observing you're talking about.

Here are some options, depending on the situation:

For seeing or noticing:

* See: This is the most basic synonym.

* Notice: Implies paying attention to something.

* Watch: Focuses on the act of looking at something for a period of time.

* Spot: Indicates finding something you were looking for.

For studying or gathering data:

* Study: A more formal synonym, implying careful examination.

* Examine: Similar to study, but more focused on analyzing details.

* Monitor: To watch something continuously over time.

* Track: To follow something's progress or movement.

For following rules or guidelines:

* Follow: This implies obeying instructions or a set of rules.

* Obey: A stronger word, emphasizing compliance.

* Adhere to: Similar to "follow" but implies sticking to something specific.

For other meanings of "observe":

* Celebrate: If you're talking about observing a holiday.

* Keep: If you're talking about observing a tradition.

Ultimately, the best synonym for "observe" will depend on the specific context of your sentence.